package com.itheima.reggie.service.impl;

import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.itheima.reggie.common.CustomerException;
import com.itheima.reggie.dto.SetmealDto;
import com.itheima.reggie.mapper.SetmealMapper;
import com.itheima.reggie.pojo.Setmeal;
import com.itheima.reggie.pojo.SetmealDish;
import com.itheima.reggie.service.SetmealDishService;
import com.itheima.reggie.service.SetmealService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.Arrays;
import java.util.List;

@Service
public class SetmealServiceImpl extends ServiceImpl<SetmealMapper, Setmeal> implements SetmealService {

    @Autowired
    private SetmealMapper setmealMapper;
    @Autowired
    private SetmealDishService setmealDishService;

    //扩展方法：保存套餐数据，以及套餐菜品关联数据
    @Override
    @Transactional
    public void saveWithDish(SetmealDto setmealDto) {
        //1. 添加套餐数据，操作setmeal表，添加一条数据
        this.save(setmealDto); //保存之前，id是没有数据的，保存之后，id有值

        //2. 添加套餐菜品关联数据，操作setmeal_dish表。添加多条数据
        List<SetmealDish> setmealDishes = setmealDto.getSetmealDishes();
        //TODO 给每个SetmealDish设置套餐id
        setmealDishes.forEach(setmealDish -> setmealDish.setSetmealId(setmealDto.getId()));
        //批量保存
        setmealDishService.saveBatch(setmealDishes);
    }

    //扩展方法：分页条件查询（套餐信息，分类名称）
    @Override
    public Page<SetmealDto> pageSetmealDto(Integer page, Integer pageSize, String name) {
        Page<SetmealDto> pageInfo = new Page<>(page, pageSize);
        return setmealMapper.pageSetmealDto(pageInfo, name);
    }

    //扩展方法：要求1：有套餐正在售卖，不能删除 要求2：删除套餐，删除套餐菜品关联数据
    @Override
    @Transactional
    public void deleteByIds(Long[] ids) {
        // 要求1：有套餐正在售卖，不能删除
        // select count(*) from setmeal where id in ( ids ) and status=1;
        Integer count = this.lambdaQuery()
                .in(Setmeal::getId, ids)
                .eq(Setmeal::getStatus, 1)
                .count();
        if (count > 0) {
            throw new CustomerException("有套餐正在售卖，不能删除");
        }

        // 要求2：删除套餐，删除套餐菜品关联数据
        // delete from setmeal where id in ( ids )
        this.removeByIds(Arrays.asList(ids));

        // delete from setmeal_dish where setmeal_id in ( ids )
        setmealDishService.lambdaUpdate()
                .in(SetmealDish::getSetmealId, ids)
                .remove();
    }

    //扩展方法：根据id查询套餐详情（包含菜品信息）
    @Override
    public SetmealDto getByIdWithDish(Long id) {
        return setmealMapper.getByIdWithDish(id);
    }

    //扩展方法：更新套餐数据，以及套餐菜品关联数据
    @Override
    public void updateWithDish(SetmealDto setmealDto) {
        //1. 更新套餐数据，操作setmeal表，添加一条数据
        this.updateById(setmealDto);

        //2. 更新套餐菜品关联数据
        List<SetmealDish> setmealDishes = setmealDto.getSetmealDishes();
        // delete from setmeal_dish where setmeal_id=?
        setmealDishService.lambdaUpdate()
                .eq(SetmealDish::getSetmealId, setmealDto.getId())
                .remove();
        //TODO 给每个SetmealDish设置套餐id
        setmealDishes.forEach(setmealDish -> setmealDish.setSetmealId(setmealDto.getId()));
        //批量保存
        setmealDishService.saveBatch(setmealDishes);
    }


}















